Fluid-pressure engine



Aug. 14, 1928. 1,680,817

R. HAMONDS FLUID PRESSURE. ENGINE Filed May 1, 19124v Patented Aug. 14,1928.

- A UNITED STATES ROBERT HAMONDS, F CLEVELAND, OHIO.

FLUID-PRESSURE i Application filed May 1,

The present invention relates to an engine which is adapted to beoperated by some fluid pressure medium such as compressed air and whichembodies nov'el features of construction. y

Further objects of the invention are to provide a compressed airoperated engine which is compara ively s mple an ine p ls ve'in it co sr c on, and wh ch w run smoothly. 7

Wi h the fo egoing a d other bj in vi w th invent q mnsis s in c rta nmbinations and arrangements of the parts as w ll m e f l y app r thedescription proceeds, the novel" features thereof being p in ed out inthe appe ded c ims.

For the full understanding of the invention reference is to be had tothe following description and accompanying drawings, in which,

Figure lis a near view of the engine.

Figure 2 is an end view of the engine.

Corresponding and like parts are referred to in the followingdescription and indicated on all of the views of the drawings by likereference characters.

Referring to the drawings which illustrate one of many possibleembodiments of the invention, the numeral 1 designates a main frame uponwhich the various parts of the engine mechanism are mounted. Extendingacross the lower portion of the main frame is the crank shaft 2, whichis journaled in the bearings 3, one of the bearings 3 being providedbetween each pair of the cylinders and also at each end of the mainframe. Each of the crank portions of the crank shaft is connected by apitman 4 to a slide 5 which operates within a tubular guide member 6. Acylinder 7 projects downwardly into the upper portion of each of theguide members 6 and is arranged coaxially therewith.

The piston guides 5 have a hollow formation and slide freely up and downon the exterior of the cylinders 7. A piston 8 is slidably mountedwithin each of thecylinders 7 and connected by a rod 9 to thecorresponding slide 5. The slide and piston are 9 thus connected so thatthey move in unison,

the piston reciprocating up and down within the interior of the cylinder7, while the slide reciprocates on the exterior of the cylinder andwithin the guide member 6; The slide thus cooperates with the tubularguide mem- 1924. Serial No. 710,309.

M lead from these openings. to the valve housings 15. Poppet valves 17are mounted L withinthese valve housings, and the valves Within thehousings function as inlet valves. The valve stems 18 extend dowIlwardlyat the back of the main frame 1,

passing through suitable uides 19 and terurinating at their lower endsin feet 20 which are adapted to :be engaged by the respective camportions 21 of a cam shaft 22. Springs 23 are connected to the valvestems 18 and nQiimally tend to move the valve stems downwardly to closethe respective valves and hold thefeet 20 thereof in position forengagement by the cam portions of the cam shaft. The cam shaft 22 isconnected b suitable gearing 24 to the main crank sha t and the ratio ofthe gearing is such that the inlet and exhaust valves are opened andclosed at the proper times for admitting compressed air to therespective cylinders or exhausting it therefrom.

The lower portion of each of the inlet valve housings communicatesthrough the pipes 25 and connection 26 with an intake manifold 27 whichreceives some fluid pressure medium such as compressed air from a supplypipe 28. The lower portions of the exhaust valve housings 16 communicatethrough the branch pipes 29 with the exhaust pipe 30. y

When the throttle valve is open compressed air is supplied to the intakemanifold 27 which communicates through the pipes 25 with the lowerportions of the inlet valve housings 15. The valves 17 of these inletvalve housings are automatically opened by the cam shaft when thecorresponding pistons 8 are at the upper limits of their movements.Compressed air then enters the cylinders and acts upon the pistons toforce the pistons downwardly. When the pistons through the exhaust valvehousings 16 and the exhaust pipe 30. As previously explained the slides5 move with the respective pistons 8 and assist in directing the pistonsin their reciprocating movements so that a smooth running action isobtained. 7

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. An engine of the character described, including a tubular guidesleeve, a cylinder having a free end which projects into the guidesleeve in a spaced relation thereto, and is concentric therewith, aworking piston mounted to reciprocatewithin the cylinder, a tubularguide mounted to reciprocat'e upon the exterior'of the cylinderin thespace between the cylinder and the sleeve,

and a rigid connection between the tubular guide and the piston.

2. An engine of the character described,

including a tubular guide sleeve, a cylinder arranged co-axially withthe sleeve, a bracket connecting one'end of the sleeve to one end of'the cylinder and supporting the cylinder with a free end thereofprojecting into the'sleeve in a spaced relation, a working pistonmounted to .reciprocate within the cylinder, a tubular guide mounted toreciprocate on the exterior of the cylinder in the space between thecylinder and the tubular guide, and a rigid connection between thesleeve and the piston.

3. An engine of the character described, including a tubular guidesleeve, a cylinder arranged co-axially with the sleeve and projectinginto the same in a spaced relation thereto, a Working piston mounted toreciprocate within the cylinder, a tubular guide mounted to reciprocateon the exterior of the cylinder in the space between the tonreciprocally mounted therein, a sleeve slidingly engaging the exteriorof the cylinder and connected to the piston to move -with and guide theplston, and a tubular guide surrounding and engaging the sleeve to guidethe same in its movements.

In testimony whereof I afiix my signature.

ROBERT HAMONDS.

